Refinancing Break-Even Calculator

1. Enter your current loan balance (what you still owe today).
2. Enter your current annual interest rate on the existing loan.
3. Enter the new rate a lender has quoted (it should be lower to produce savings in this model).
4. Enter remaining term in years — how long you would keep amortizing if you do not refinance.
5. Enter refinancing closing costs (origination, appraisal, title, and similar fees).

The tool estimates your current and new monthly payments on the same balance and remaining term using standard amortization math. Monthly savings is the difference between those payments. Break-even months equal closing costs divided by monthly savings (rounded up). Total interest saved approximates savings over all remaining payments minus the closing costs. A savings schedule shows gross and net savings at selected year checkpoints.

Monthly savings = Old payment − New payment
Break-even (months) = ceil(Closing costs ÷ Monthly savings)
Net savings over term ≈ (Monthly savings × months remaining) − Closing costs

Suppose you owe $250,000 at 7.5% with 20 years left, a new quote at 5.5%, and $5,000 in closing costs. The model computes a lower new payment and positive monthly savings. Break-even is closing costs divided by that monthly savings — often in the tens of months when the rate drop is about two percentage points on a large balance. If you expect to sell or refinance again before that break-even month, the upfront fees may not pay for themselves even if the payment looks better. If you keep the loan well past break-even, net savings over the remaining term can be substantial after subtracting the $5,000 cost. Always confirm whether the new loan resets term length in real life; this tool keeps the remaining term constant for an apples-to-apples rate comparison.

Monthly savings

How much lower the estimated new payment is versus the current payment under the inputs you entered.

Break-even point

Months of savings needed to recover closing costs. If you will not keep the loan that long, refinancing may lose money even with a lower rate.

Total interest saved

Rough net benefit over the remaining term after subtracting closing costs. Negative or “not worth it” signals mean costs dominate savings in this model.

New monthly payment

Estimated payment at the new rate for the same balance and remaining term — useful for budgeting, not a lender quote.

• Ignoring closing costs and only comparing the advertised rate.
• Refinancing when you plan to move or sell before break-even.
• Extending the loan term in a real refinance without noticing you may pay more interest over life even with a lower rate.
• Forgetting prepayment penalties or cash-out amounts that change the economics.
• Treating a tiny rate drop as automatically “worth it” without running break-even months.

Payments use standard amortization on the entered balance, rates, and remaining term. Closing costs are treated as a lump sum paid at refinance with no financing of fees into the new balance. No prepayment penalties, escrow, PMI, or tax effects. “Not worth it” appears when savings are zero/negative or break-even exceeds the remaining months. Educational estimates only.

• CFPB — Considering a refinance
• CFPB — Closing costs and fees
• AlgoFinanceLab — Loan refinancing guides

Dig deeper with our loan refinancing guide — when it makes sense, or try Business Loan Qualifier and Credit Score Impact Analyzer.

Estimates only — not financial, lending, or investment advice. Decisions should be based on your full situation and professional guidance where appropriate.